Abstract: A secondary seat belt warning system for a motor vehicle includes at least one control module for activating at least one secondary warning signal. The secondary seat belt warning system also includes a driver seat belt sensor for producing an input signal indicative of a state of a driver seat belt between a buckled and unbuckled condition. The secondary seat belt warning system includes at least one passenger seat belt sensor for producing an input signal indicative of a state of at least one passenger seat belt between a buckled and unbuckled condition. The at least one control module communicates with the driver seat belt sensor and the at least one passenger seat belt sensor for activating the at least one secondary warning signal to alert a corresponding occupant of the motor vehicle if the state of at least one of the driver seat belt and the at least one passenger seat belt is the unbuckled condition.

Abstract: An electronic fuel injection system in which an electronic engine control module connected to engine-position-responsive sensors generates a cylinder identification waveform which is synchronized with a fuel demand control waveform. The two waveforms are transmitted to an electronic driver module which distributes high-level actuating signals to the individual fuel injectors based on the two waveforms received from the engine control module. To assure the reliability of the communication link connecting the two modules, synchronized signal excursions on the two waveforms are displaced in time one from another by a preset delay interval. At the driver module, the delay interval between corresponding excursions on the two received waveforms is measured and, if the measured interval deviates substantially from the preset interval as transmitted, the generation of actuating pulses is inhibited to prevent potentially dangerous engine surging.